10,000 subscribers a package of 100 standard definition (SD) IP broadcast TV
channels. If we assume that the provider is using H.264 to compress the
channels, this generally translates to a bandwidth requirement of at least
2 Mbps for each broadcast channel. In the scenario where at least one
subscriber is accessing each channel at a particular instance in time then the
Next Generation Network (NGN) core distribution network will require
200 Mbps of bandwidth capacity. This is the bandwidth requirement from the
IPTV data center to each of the regional offices. At these offices techniques
such as IGMP snooping can be used to reduce the bandwidth required over
the local access section of the network. Note that H.264 and 1GMP will be
described in greater detail later in the book.
đang được dịch, vui lòng đợi..
